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Group scheduling: create a plan link, mark availability, get best times, and lock the final time.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 26 days ago Due for re-check
A server can change after it's graded. Re-run the automated scan to refresh this report.
This grade is deterministic and reproducible: the same server surface always yields the same grade under a given algorithm version. It is a real automated assessment computed by the MCPGrade engine from what the probe actually observed — not a fabricated or opinion score. It is not a manual human pentest, so it can miss context-specific risks.
Every signal below was measured directly by the automated probe. The grade is derived only from evidence like this — nothing is assumed.
The whenna MCP server exposes 7 tools, focused primarily on general-purpose capabilities. Its published description reads: "Group scheduling: create a plan link, mark availability, get best times, and lock the final time". It communicates over Streamable HTTP using the 2026-07-28 protocol revision, and does not require authorization to connect. MCPGrade currently rates whenna F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Cross-tool shadowing" and "Cross-tool shadowing". This report is a deterministic, reproducible automated assessment: the same observed surface always yields the same grade under a given algorithm version, and it is refreshed as new scans arrive and free to read — but it is not a substitute for a manual human security review. Always re-check whenna's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add whenna to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://whenna.com/mcpStreamable HTTP transport. This is the MCP endpoint, not a website — paste it into your MCP client server list rather than a browser.
Captured passively during the read-only scan. Click any value to find servers that match it.
The tools this server advertises via tools/list — names, purposes, and the parameters each accepts, exactly as enumerated read-only.
Create a Whenna plan (a shareable link that finds the time everyone is free). Returns the link to share with humans or other agents, and a creator_key that authorizes locking the final time. Times are
Fetch a Whenna plan: title, window, every participant's availability, ranked best times, the locked final time if set, and a negotiation brief — state (awaiting_answers | collecting | everyone_overlap
Sorted worst-first. Each finding shows its severity, what it means, its OWASP MCP Top-10 mapping, and a recommended fix — the check id links to the exact methodology row that produced it.
tool: whenna_set_place
A tool description tries to alter the model’s use of another tool.
RecommendationDescriptions must describe only their own tool.
tool: whenna_lock_time
A tool description tries to alter the model’s use of another tool.
key returned by whenna_create_plan). Pass use_best:true to lock the top-ranked besRecommendationDescriptions must describe only their own tool.
tool: (server instructions)
A tool description tries to alter the model’s use of another tool.
. Typical flow: whenna_create_plan → share the returned url with humans and/or calRecommendationDescriptions must describe only their own tool.
The server accepts tool enumeration (and likely invocation) with no authentication.
RecommendationRequire OAuth 2.1 authorization for any server exposing non-public tools.
tool: whenna_create_plan
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "whenna_create_plan"RecommendationScope tools to the minimum needed.
tool: whenna_mark_availability
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "whenna_mark_availability"RecommendationScope tools to the minimum needed.
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Agentic rails for complex workflows with receipts, fees, and MCP tool access.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Set a participant's free times on a plan (replaces that participant's previous answer). Express availability as free ranges per day; the server converts them to slots. Use the participant's human name
Set where the group meets: a place name, or video_call:true to attach Whenna's built-in encrypted video room (the room link then goes on everyone's calendar automatically). Place and video room are mu
Group memory: start the group's next plan from a finished one. Clones the setup (title, hours, place/video, discussion), proposes the next occurrences of the locked weekday as candidate days, links ol
Ranked best meeting times for a plan: contiguous blocks where the most participants are free, with who is free in each block.
Lock the final time on a plan (requires the creator_key returned by whenna_create_plan). Pass use_best:true to lock the top-ranked best time automatically, or give an explicit day/start. Everyone view